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Attempts to delete a Relationship Class in ArcCatalog may result in the following error:
Failed to delete selected object(s)
Locked by database user: '<username>' on machine: '<machine name>']
This error occurs under the following circumstances:
1. The owner of the relationship class does not own all of the related objects.
2. The owner of the relationship class has only SELECT privileges on the related objects that they do not own, but not UPDATE, INSERT, and DELETE.
Grant the owner of the relationship class full read/write privileges on the objects they do not own.